schmaltz



(No Model.) 3 Sheets-Sheet 1.

' F. SOHMALTZ.

SAW SHARPENING MAGHINE. No. 453,431. Patented June 2,1891.

(No Model.) 3 sheets sheet 3.

F. SCHMALTZ. SAW SHARPENING MACHINE.

.No. 453,431. Patented June 2, 1891 [WEB/Z072, 1626a]; JdmaZi/g THENumus wzrzns 0a., wwrcwuwm WASNINGTON, o, c.

UNITED STATES PATENT OFFICE.

FRIEDRICH SOHMALTZ, OF OFFENBACH-ON-THE-MAIN, GERMANY.

SAW-SHARPENING MACHINE.

SPECIFICATION forming part of Letters Patent No. 453,431, dated June 2,1891.

Application filed October 22, 1889. Serial No. 827,862. (No model.)Patented in Germany January 8, 1888, Nos. 45,747 and 47,616, and inEngland June 15,1889, No.16,3'73.

To all whom it may concern:-

Be it known that I, FRIEDRICH SCHMALTZ, a resident ofOifenbach-on-the-Main, Germany, and a subject of the Grand Duke ofHesse, have invented certain new and useful Improvements in Machines forSharpening Saws, (for which I have obtained Letters Patent in Germany,No. 45,747 and No. 47,616, dated January 8, 1888, and in Great BritainNo. 16,373, dated June 15, 1889,) of which the in the claims.

In the accompanying drawings, Figure 1 is a front view of a machineconstructed in accordance'with my invention. Fig. 2 is a side view ofthe same. Fig. 3 is a back view. Figs. 4 to 11 are detail views ofdifferent parts.

In the said drawings, the reference-numeral 1 designates the frame ofthe machine, in which is mounted the main shaft 2, carrying adriving-pulley 3.

Mounted upon the oscillating frame 4,pivoted in a support secured to theframe 1 is the grinding-disk 6 driven by means of belt 8, passing overpulleys 3 and 4, and also over the intermediate pulleys 9 9. The frame 4can oscillate on its pivots 10, so as to elevate and depress thegrinding-disk, and it is provided at its rear with an extension 12,pivoted thereto at 13 and provided with a forwardly-extending arm 14,projecting under the end of the bar.

15 is a set-screw carried by frame 4 and bearing against the arm 14 ofthe extension 12, whereby the frame 4 may be raised orlowered and thegrinding-disk very finely adj usted with relation to the saw.

Mounted in the frame of the machine is a shaft 16, having at one end apulley 17, which is driven by a belt 18, passing over pulley 19 on shaft2, and also over the inclined idler 20 on the frame 1. This shaft 16carries a crank-wheel 21 and at its opposite end a similar wheel 22.This wheel 21 serves to raise and lower the frame 4 and itsgrinding-disk by means of a chain 23, connected with the extension 12,the lever 24, pivoted in arm 25, secured to frame 1, and theconnecting-rod 26, connected at one end with the lever and at the otherend with a pin or crank 27, secured in the groove 28 of wheel 21. Bychanging the position of the pin in this groove of the said wheel themovement of frame 4 and the grinding-disk will be changed. Then grindingdisk fall, owing to its overweight.

Upon further revolution of the wheel, however, the lever will bedepressed, causing the chain 23 to depress extension 12, andconsequently raising frame 4 and the grinding-disk. These operationswill be continuousthat is to say, at each revolution of wheel 21 thegrinding-disk will be elevated and depressed to bring it out of and intocontact with the teeth being sharpened.

The pivot 10 of the frame 4 is mounted in a rotatable frame 29, pivotedby means of pivot-bar 30 in the support 5, so that a lateral adjustmentmay be given to the frame and grinding-disk, as well as a verticaloscillating movement.

The wheel 22 is similar to wheel 21 in construction, and theopin orcrank 31 thereof is connected with a rod 32, which in turn connects withthe two-armed pivoted lever 38, which actuates a trigger-hook 34 to movethe saw forward after a tooth has been sharpened and present a new toothto the action of the grinding-disk. During one half of the revolution ofwheel 22 the trigger-hook slides over the back of the tooth, to thenfall into the groove between the two teeth, and during the other half ofthe revolution the trigger engages with the tooth and moves the sawforward.

By the mechanism described above all the outlines of a saw-tooth may beoperated upon by the grinding-disk.

To provide for what I term a balancing motion of the saw, whereby thesame may be given a lateral oscillating motion, so that thegrinding-disk may form the side and top bevels seen in Fig. 11,1 providethe following mechanism: The saw is fixed in a slide 34, which ismovable horizontally on the rail 35. This rail is connected with asimilar parallel rail 36 by means of the pivoted connectingrods 37, andsaid rail 35 maybe adjusted vertically to the proper height by means ofbent or two-armed lever 38, pivoted or fulcrumed to rail 36 at 38, theupper arm of said lever being pivoted to rail 35, while the lower arm isconnected by means of rod 3S with footlever 39, fulcrumed to themachine-base at 40. By depressinglever 39 rail 35 is elevated, and viceVersa. Connected with rail 36 is a bowpiece 41, which is also connectedwith the eccentric-rod 42. This rod 42 gives the lateral oscillatingmotion to the saw. It rests in curved bearings in a circular segment 43on the support. 44, secured to frame 1, so that as it is oscillated, ashereinafter described, it will describe an arc of a circle in saidsegment. At its bottom it is provided with a curved foot-bearing 44.This rod is placed at the side of the oscillation-plane of thegrinding-disk, so that as the rod is oscillated, as hereinafterdescribed, the saw is brought alternately obliquely to the right andleft of the grinding-disk, and is contacted by the same, not at itslowest point, but with two corresponding points located higher to theright and left of the same, so that the sides of the cutting-disk formthe cutting-faces.

The cutting-face of a tooth and the back of the next preceding onehaving an equallydirected inclination,or are beveled in the samedirection, this inclination or bevel is changed at the followingcutting-line. (See Fig. 11.) The change of position of the saw musttherefore take place suddenly, bya jerk, and at the time that thecutting-disk leaves the back of atooth-that is to say, always after afull revolution of shaft 16. This movement of the rod 42 is effected bymeans of shaft 45, mounted in frame 1, and carrying a gear-wheel 46,meshing with a similar wheel 47 on the shaft 16, these gears being soproportioned that wheel 46 makes a half-revolution only while wheel 47makes a full one. The shaft 45 carries a disk 48, provided with a pin49, which e11- gages with a pceuliarly-outlined sliding plate 50. Asshown in Fig. 8, this sliding plate consists of a rim having a centraloval-shaped recess, and at its longest diameter is provided with tworecesses or indentations so that the pin 49 (see Fig. 10) will engagewith one of said recesses in its way from a to Z2 and from c to (Z,causing it to move quickly to one side while the plate remainsstationary when the pin travels from b to c or from d to a. Thecurves 1) c and d (b are arcs of circles, with the same radius as themotion of the pin 49.

Connected with plate 50 by means of lugs 53 (see Figs. 6 to 9) is aplate 54, which transmits the jerking motion thereof by means of shortshaft 55 to a second plate 56, secured to the rod 42. This oscillationof rod 42, through the medium of the how 41 connected therewith,oscillates the rails 36 and 35 and causes the saw carried by the latterto be presented obliquely to the cutting-disk.

The plates 54 and 56 are provided with slots 57 and ribs 58, which formways for the slide 59, which carries shaft 55, so that said shaft ishorizontally adjustable therein, so that the stroke of plate 56 may bevaried and a greater or less play allowed the rod 42, resulting in thesaw being presented more or less obliquely to the grinding-disk.

The circular segment 43, which serves as the upper support of the rod42, has an extension 60, against which the saw rests. (See Fig. 7.)

The frame-piece 63, Fig. 5, the bolt 64, with screw-nut 65, and thecompression-rod 66, retating around bolt 64, serve the purpose ofpressing the saw against its supports. The frame-piece 63 and rod 66have oblique contact-surfaces fitting on and pressed against each otherby the screw-nut 65. The rod 66, therefore, can be so placed, bysuitably placing the same and setting the nut 65, that it exerts thenecessary pressure upon the saw without interfering with a regularforward movement of the same.

To temporarily stop the grinding-disk and the mechanism for advancingthe saw, I provide the following means: The support 5 carries a smallshaft 68, (see Figs. 2 and 7,) having on one side a small hand-wheel 69and an eccentric 70, and on the other side an arm 71, securely fixed tosaid shaft, and a lever 72. By turning handwheel 69 the eccentric 70 ismade to catch under a projection 7 3 on frame 4, and the same andthegrinding-disk are elevated and the latter thrown out of engagementwith the saw. At the same time the trigger-hook 34 is withdrawn from thesaw by means of the lever 72, and the forward move ment thereof isstopped. In reversing the hand-wheel and lowering the grinding-disk, thelever 72 is also lowered and the triggerhook returned to its formerposition to feed the saw. In this way there is no liability ofinterference between the grinding-disk and the advancing mechanism.

Having thus described my invention, what I claim is- 1. In asaw-sharpening machine, the com bination, with the pivoted frame, and agrinding-disk journaled in one end of said frame, of the wheel 21,aconnecting-arm 26,1ever 24, extension 12, and chain 23, substantiallyas described.

2. In a saw-sharpening machine, the com- IIO bination, with the verticaleccentricallymounted rod 42 and the upper support 44, of the segment 43on said support, the framepiece 63, the bolt 64, screw-nut 65, andcompression-rod 66, substantially as described.

3. In a saw-grinding machine, the combination, with the shaft 45, thedisk 48, having pin 49, and. the sliding plate 50, having ovalshapedrecess and depressions 50, of the plate 54, connected With plate 50, theplate 56, connected by shaft 55 with plate 54, the eccentric-rod 42, thebow-piece 41, and the connected rails 36 and 35, substantially asdescribed.

4. In a saw-sharpening machine, the combination, with the shaft 45, thedisk 48, having pin 49, and the sliding plate 50, having oval-shapedrecess and depressions 50, of the plates 54 and 56, the shaft 55,saidplates having slots 57 an'dribs 58, the slide 59, the eccentric-rod 42,the bow-piece 41, and the connected saw-carrying, rails 36 and 35,substantially as described.

5. In a saw-sharpening machine, the combination, With the pivoted frame4, provided with extension 12, pivoted thereto at 13, and provided witha forwardly-projecting arm 14, of the pressure-screw 15, carried byframe 4 and bearing against arm 14, substantially as described.

6. In a saw-sharpening machine, the combination, with the frame 4 andthe grindingdisk carried thereby, of the eccentric 70, the shaft 68, theprojection 73 on frame 4, the arm 71, and lever 72, substantially asdescribed.

7. In a saw-sharpening maehine, the com bination, with the slide 34, therail 35, the parallel rail 36, connecting-rods 37, and levers 3S and 39,substantially as described.

In testimony that I claim-the foregoing as my own I have hereuntoaffixed my signature in the presence of two Witnesses.

FRIEDRICH SOHMALTZ.

Witnesses:

ALVESTO S. IIOGUE, JEAN GRUND.

